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Quantum Beam Science, Volume 9, Issue 1

2025 March - 10 articles

Cover Story: To lead thermal neutrons from a moderator to a sample under investigation, they are sent through neutron guides with reflective surfaces. Elliptical neutron guides are known to transport neutrons with fewer reflections than straight guides, reducing neutron losses. Since true elliptical shapes are tedious to produce, the elliptical shape may instead be approximated by linearly tapering pieces. In this work, we use the neutron simulation package McStas to investigate this approximation for both simple and realistic guide systems. We show that splitting a model elliptical guide into linear pieces with lengths of up to 3 m does not damage transport properties. For one realistic guide system, we show that the elliptical guide can be approximated with pieces 0.5 m in length without detriment to transport properties. View this paper
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Articles (10)

  • Editorial
  • Open Access
1,576 Views
4 Pages

Welcome to the Special Issue of Quantum Beam Science, entitled “Analysis of Strain, Stress and Texture with Quantum Beams, 2nd Edition” [...]

(This article belongs to the Special Issue Analysis of Strain, Stress and Texture with Quantum Beams, 2nd Edition)
  • Review
  • Open Access
11 Citations
10,502 Views
18 Pages

Colloidal quantum dots (QDs) have emerged as promising materials for the development of infrared photodetectors owing to their tunable band gaps, cost-effective manufacturing, and ease of processing. This paper provides a comprehensive overview of th...

(This article belongs to the Special Issue Quantum Beam Science: Feature Papers 2024)
  • Article
  • Open Access
3 Citations
3,226 Views
14 Pages

Investigation of Mn2+-Doped Stearic-Acid Through XRD, Raman, and FT-IR, and Thermal Studies

  • Rodrigo M. Rocha,
  • Marinaldo V. de Souza Junior,
  • Luiz F. L. Silva,
  • Paulo T. C. Freire,
  • Gardênia S. Pinheiro,
  • Waldomiro Paschoal,
  • Francisco F. de Sousa and
  • Sanclayton G. C. Moreira

In this research, we investigated the influence of Mn2+ ions on the packing in stearic acid (SA) crystals through the use of Raman spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The crystals investigated w...

(This article belongs to the Section Engineering and Structural Materials)
  • Article
  • Open Access
1 Citations
3,254 Views
14 Pages

Dosimetric Study of Flattened Versus Unflattened Filter-Free Medical Linear Accelerator: Experimental Measurements and Monte Carlo Calculations

  • Mohammed Halato,
  • Ibrahim I. Suliman,
  • Abdelmonim Artoli,
  • Francesco Longo and
  • Gianrossano Giannini

A dosimetric study compared flattened filter (FF) and unflattened filter-free (FFF) 18 MV medical linear accelerators (LINAC) using BEAMnrc Monte Carlo (MC) calculations and experimental measurements. BEAMnrc MC simulations were initially validated a...

(This article belongs to the Special Issue Quantum Beam Science: Feature Papers 2024)
  • Feature Paper
  • Review
  • Open Access
4 Citations
3,139 Views
18 Pages

Soft matter and biological materials are characterized by a complex morphology consisting of multiple structural levels that are either hierarchically organized or coexist over a length scale from a few Å up to the size of µm. For a struc...

(This article belongs to the Special Issue Quantum Beam Science: Feature Papers 2024)
  • Feature Paper
  • Article
  • Open Access
1 Citations
2,583 Views
14 Pages

Piecewise Linear Approximation of Elliptical Neutron Guides—A Case Study for BIFROST at ESS

  • Daniel Lomholt Christensen,
  • Rebekka Frøystad,
  • Martin Andreas Olsen,
  • Kristine Marie Løfgren Krighaar,
  • Asla Husgard,
  • Mads Bertelsen,
  • Rasmus Toft-Petersen and
  • Kim Lefmann

Previous studies of elliptical neutron guides have shown that they transport neutrons with fewer reflections than traditional guides with a constant cross section, thus reducing neutron losses. True elliptical guides, however, are tedious to produce....

(This article belongs to the Section Instrumentation and Facilities)
  • Article
  • Open Access
2,400 Views
9 Pages

Recently, it has been experimentally shown that the sheath acceleration of protons from ultra-thin metal targets irradiated by sub-picosecond laser pulses of intensities above 1021 W/cm2 is suppressed compared to well-established models. This detrime...

(This article belongs to the Section Instrumentation and Facilities)
  • Article
  • Open Access
6 Citations
2,617 Views
17 Pages

Effect of Dy3+ Ions on Structural, Thermal and Spectroscopic Properties of L-Threonine Crystals: A Visible Light-Emitting Material

  • João G. de Oliveira Neto,
  • Otávio C. da Silva Neto,
  • Jéssica A. O. Rodrigues,
  • Jailton R. Viana,
  • Alysson Steimacher,
  • Franciana Pedrochi,
  • Francisco F. de Sousa and
  • Adenilson O. dos Santos

In this study, L-threonine crystals (L-thr) containing Dy3+ ions (L-thrDy5 and L-thrDy10) with varying mass concentrations (5% and 10%) were successfully synthesized using a solvent slow evaporation method. The structural properties were characterize...

(This article belongs to the Section Engineering and Structural Materials)
  • Article
  • Open Access
45 Citations
2,023 Views
9 Pages

Most physicists are dissatisfied with the current explanation of quantum mechanics, and want to find a method to solve this problem. However, this problem has not been solved perfectly up to now. In this paper, annihilation-generation movement (AGM)...

(This article belongs to the Special Issue New Challenges in Electron Beams)
  • Review
  • Open Access
2 Citations
2,948 Views
21 Pages

The interaction of pulsed lasers with matter involving nanomaterials as a pure target or thin layer deposited on a target initiates transient plasma, which shows strong enhancement in a spectral line emission. This domain of research has been explore...

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Quantum Beam Sci. - ISSN 2412-382X